Latch.



W. H. BURK.

y LATCH.

APPLICATION FILED 113.25. ma.

Patented @1129,1919.

LSQLSSM..

l 92510 il WITNESS e im r mm caricia 'WILLIAM H. BURK, OF CHICAGO,ILLINOIS, ASSIG-NOR TO AMERICAN STEEL 'WINDOW i COMPANY, OF CHICAGO,ILLINOIS, A. CORPORATION 0F ILLINOIS.

LATCH.

Specification of Letters Patent.

Patented Apr. se, mie..

Application led February 25, 1918. Serial No. 219,100. l

To all whom t may concern.'

Be it known that I, WILLIAM I-I. BURK, a citizen of the United States,residing at Chicago, in the county of Cook and State of simple andellicient latch which will initiallyautomatically latch and retain thewindow (or other swinging member) in latched position against rebound ordisengagement, and which may then, by manipulation of an operatinghandle, be operated to draw the window sash i'nto close-fittingengagement with its frame, in which position it will be firmly securedandy maintained without any tendency to work loose. With this and`incidental objects and advantages in view I have devised and inventedthe. embodiment of my invention illustrated in thedaccompanying drawingsand hereinafter described, the essential elements of which are moreparticularly recited in the appended claims.

In the drawing Figure l shows in vertical cross-section a portion of awindow frame and a partly latched window to which my invention (shown inelevation) is applied; Fig. 2 isa similar view showingthe-latch andkeeper in completely latched engagement; Fig. 3 is a view of the latchand keeper, the parts being viewed in a direction at right angles to thedirection of view in Fig. 2, and the handle, and part of the windowframe being partly broken away to better show the construction of theparts; Fig. 4 is a plan view'of latch, parts lying above it being brokenaway; and Fig. 5 1s a perspective of the latch member alone.

Y rIhe same reference characters designate the same parts in all thefigures of the drawing.

In the particular and preferred form of embodiment of my invention shown1n the drawings, the lower frame member of the window frame consists ofa section of structuraliron 1 forming a portion of the wall structureand having an outwardly disposed face 2. Secured to the strip 1 is an|Lshaped metal bar 3, in the vertical member of which is pivotallymounted the latch member of my fastening device. Thelower rail of thewindow or sash consists of a flanged bar 4, which may conveniently bemade of the shape shown in cross-section in Fig. 2, with a dependingflange 5 and a horizontal top plate 6, to the lower side of which latterportion is secured the keeper 7 of the fastener. rIhe window is hingedat its top to the casing, and if desired the side and top members of thewindow and window opening may be formed with members corresponding tothose already described at the bottom, so that the flanges of the windowwill abut against the outwardly arranged faces of the structurall thebar 3, and this latch includes an operating handle 8 to the pivot 9 ofwhich is pinned a short arm or cam block 10, a lug 10a projecting in theopposite direction being provided to limit its rotation in a righthanddirection by contact with the top of the base of a bearing bracket 21secured to the bar 3 and having a vertical portion 22 Y formed with abearing which engages and pivot. As most clearly shownin Figs. 1, 2 and4, the block 10 is formed with an outer inclined cam-face 11 whichcoperates, as

4supports the outermost end of, the latchthe window is closed, with thedownwardly directed portion 7EL of the keeper to rock the latch and liftthe handle against gravity and the stress of a spring 2Ol housed in arecess formed in the hub of. the block 10, one end of which springengages said hub and the other the face of the bar 3. When the window isnearly closed, the keeper clears the high point of the cam-face 11 andthe spring, assisted by the weight of the handle causes the latch torock in the opposite direction,

and the uppermost, vertical section 12 of its inner face `to engage thekeeper. Inasmuch as the face 12 exhibits no cam action, no re- 7 boundof the windovs7 will act upon it to rock the latch in an oppositedirection and release the Window. Below the face l2 the block 10 isformed with a cam surface 13 which by operation of the handle 8 may becaused to react upon the keeper to draw the window tightly to its seatin the window frame. As the window seats firmly and tightly into place,the lower end of the cam surface 13 is reached and a lower, plane,retaining surface 14, normal or substantially normal to the aXis ofrotation of the latch, is brought opposite the edge of the keeper. Sincethis face is entirely incapable of exerting any camming cooperation withthe keeper, the Window will remain firmly seated, and no amount ofjarring or vibration will have any effect in tending to cause the latchto become disengaged. i

It will be observed that the mechanism is extremely comipact and whenthe window is closed all of the elements (except the handle) are tightlyhoused. `Then the window is open the keeper is sheltered beneath theflange 5 of the lower rail of the window, and the ivindov itself affordssome protection to the latching member. Owing to the simplicity ofconstruction of the parts and their sheltered arrangement, my novelfastening device is therefore little liable to derangement ordeterioration from destructive weather conditions. However, it is'obvious that the latch mechanism may be applied to many structures towhich these considerations do not apply, and my claims to such mechanismare in no wise limited to the particular window construction hereindescribed.

l. A fastening device comprising a keeper and a manually-operablepivoted latch member, said latch member being formed on one side with acam face arranged to automatically coperate with the keeper when movedagainst it to effect rocking of the latch member, and on the other sidebeing formed with an initial engaging face and with a cam face adjacentsaid engaging face and ar ranged to coperate with the keeper by manualoperation of the latch member.

2. A fastening device comprising a keeper and a manually-operableypivoted latch member, said latch member being formed on one side with acam face arranged to automatically coperate with the keeper when movedagainst it to eect rocking of the latch member, and on the other sidebeing 'formed with neonata -a cam face adapted to coperate lwith thekeeper by manual operation of the latch member and with a retaining facenormal to the aXis of the pivot of the latch.

3. A fastening device comprising a keeper and a manually-operablepivoted latch member, said latch member being formed on one side With acam face arranged to automati cally coperate With the'keeper when movedagainst it to effect rocking of the latch member, and on the other sidebeing formed with an initial engaging face and with an inter nediate'camface and with a final retaining ace.

4:. A fastening device comprising a keeper and a latch consisting of amanually-operable pivoted rocking arm yieldingly urged .toward saidkeeper, said arm at its end being formed on one side with a cam facearranged to automatically coperate with the keeper y when moved againstit to effect rocking of the arm, and on the other side beingformed withan initial engaging face and with a cam face adjacent said engaging faceand arranged to coperate with the keeper by manual operation of therocking arm.

5. A fastening device comprising a keeper and a latch consisting of apivoted rocking arm and a rigidly connected oppositely arranged handleof preponderating weight tending to urge said arm toward said keeper,said arm at its end being formed on one side .with a cam face arrangedto automatically coperate with the keeper when moved against it toeffect rocking of the arm, and on the other side being formed with aninitial engaging face and with a cam face adjacent said engaging faceand arranged to cooperate with the keeper by manual operation of thehandle.

6. In structures of the character described and including a Windo.7frame, a swinging window having its lower rail provided on its outerside with a depending flange arranged to abut against the window frame,the Window frame being provided on its inner side with an upstandingflange abutting the lower rail of the Window, a depending keeper securedto the lower window rail and arranged Within the depending flange, and acatch member pivoted in said upstanding flange of the casing and havingan en gaging portion arranged within said upstanding flange and anoperating handle without the same.

LLlAM Il. BURK.

